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When Edward Jenner proposed to the parents of 8-year-old James Phipps the risky idea that rubbing some stuff from sick cows onto the young lad might protect him from small pox, James’ parents faced a choice. It was 1794 and smallpox was ravaging the British population, and in that emotional environment, the fear of smallpox won out over the frightening idea Jenner was proposing.

With no data or experience to go on, James’ parents could only rely on their emotions and instincts. Since then, we’ve learned an immense amount about vaccination, firmly establishing that the benefits of vaccines far outweigh their real but minimal risks. But those facts don’t change the reality that we consider whether to vaccinate in a psychological choice environment shaped far more by our feelings than the facts alone. The modern vaccination program offers two clarion examples of the emotional nature of our risk perception system, and how it can sometimes get us into trouble.

1. Childhood vaccination.

Despite lots of alarming news stories about declining childhood vaccination rates, in general those rates remain high. The vast majority of parents worry more about the diseases than the vaccines that prevent them, or trust their health care providers and just follow their advice. (A full list of rates per disease, per state, are in this CDC chart.)

The facts about the risks of diseases and vaccines are the same for the tiny group of vaccine refusers or the slightly larger group of those hesitant about the recommended schedule as they are for the general public. But the psychological choice environment in which the “refusers/hesitants” are making vaccine decisions is different. Some of those people don’t like the government telling them what to do. Some have particularly high fears of human-made risks, like vaccines. Some live in communities that place high priority on micro-level decision making about parenting. These different emotional risk perception factors lead them to worry more about the vaccines than the diseases, or mistrust the public health system that recommends vaccines, or the pharmaceutical industry that produces them.

As a result of those emotional differences, these people expose their kids and themselves and the public to far greater risk than the minimal danger of vaccines. But these choices are neither irrational, nor “science denialism,” as some academics and doctors and pundits dismissively label them. These choices are based on people’s legitimate and valid feelings. These choices are based on people’s legitimate and valid feelings, emotions and instincts we all we all use to assess the facts and gauge potential risk. The feelings and values and life experiences and circumstances of the refusers and hesitants just lead them to see the same facts about vaccines through different emotional lenses than most people do.

However, valid as those feelings may be, it is undeniable that they put those people, and their kids, and their friends and neighbors and communities, at risk.

2. Seasonal influenza vaccine

Childhood vaccination is getting most of the attention from the news media that now raises alarms about declining vaccination rates but just a few years ago was full of scary stories about the risks of vaccines, helping trigger the very decline about which they are now raising concern. But another form of vaccination offers a lesson about the potential danger of our emotion-based risk perception system; the regular vaccination for seasonal flu, which is now recommended for everyone 6 months old and up.

But the psychological choice environment for whether to get a flu shot is different than the factors influencing concerns about childhood vaccination. When risks to kids are involved, fears almost always run higher. But flu is familiar, and familiarity with any risk reduces concern. The flu shot is always available, so we think that we can always go get one… a reassuring sense of control that seduces some of us into not worrying enough to get the shot in the first place.

We worry more about new UNfamiliar flu, or when there might be vaccine shortages and we lose that sense of control. But in normal times, far fewer of us get flu shots than should. And unless you’ve had a bad case of influenza, you’re like most people; you don’t think getting it is that bad… and when we don’t sense a lot of suffering from a risk, we don’t worry about it as much. (Trust me on this one. You REALLY SUFFER, for weeks or more, when you get a bad case of influenza, as millions do each year.)

Two vaccine issues. Two different sets of numbers, two different sets of emotional factors that cause some of us worry more than we need to, or less than we should. But together, these examples illustrate a single phenomenon; the Risk Perception Gap, the risk we face when our fears don’t match the facts. These examples help make the case that we need to recognize how powerfully the psychological choice environment shapes our judgments and behaviors, and account for those emotional factors as we try to make healthier choices for ourselves and for society.